Paper box and blank thereeob



R. F. THORNDIKE.

PAPER BOX AND BLANK THEREFOR.

APPEICATION FILED APR. 6. me.

1 19mm?! I I PatentedAug. 1,1916.

- To all whom it may concern."

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PAPER BOX AND BLANK THEREFOR.

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Application filed April 6, 1916. Serial No. 8 9,451

Be it known that I, ROTHGHILD F. THORN- DIKE, of Chelsea, in the county of Sufiolk and State of Massachusetts, have invented certain new and useful Improvements in Paper Boxes and Blanks Therefor, of which the following is a specification.

This invention relates to the manufacture of paper or pasteboard boxes, and has particular reference to that type sometimes called knock-down boxes, and which are produced in flat form by machinery, and shipped in that form to the users who turn up the side walls and manipulate some interengaging flaps or tongues to lock the corners and retain the walls in upright positions. Such boxes are usually made of very cheap stock and the interengaging or locking portions frequently tear or become accidentally disengaged especially when of the size and shape known as suitcase boxes.

The objects of my'invention are to provide strong and durable boxes of this character, the walls of which boxes are of double thickness with no raw edges exposed, which boxes may be economically and rapidly made by machinery with the minimum waste of stock, and provided with means whereby, when converted from flat form to produce either the bottom or cover members of boxes, will be so absolutely locked at the covers that the interengaged portions cannot possibly be separated accidentally and can be intentionally disengaged only with difliculty.

Of the accompanying drawings: Figure l is a plan view of the left hand portion of one form of blank embodying my invention, as produced ready to be'shipped and set up by the user, the dotted linesindicating the complete shape of the piece 'of paper or pasteboard as died out. Fig.2 is a view similar toFig. 1 but showing the right hand portion of a box member blank which is cut and creased in a slightlytdilferent manner from that illustrated in Fig. 1. Figs. 3, 4, 5 and 6 are detail perspective views to illustrate successive steps in the setting up of the Fig. 1 structure to box member form, it being understood that each of the four corners is interlocked in thesame manner. Figs. 7 and 8 are views similar to Figs. 3 and 6 respectively, illustrating the setting up of the blank of the Fig.2 structure. Fig. I

9 is a view similar to a portion of Fig. 1, illustrating another embod ment of myin- Specification of Letters Patent.

Patented Aug. f, 11916.

. vention. Figs. 10, 11 and 12 are detail perspectives to illustrate the setting up of the that the other portion, which is broken away,

will have the same arrangement of cut and creased lines. The rectangular'central portion 12 has side sections 13, 14, the latter, when the blank is died out or otherwise made, extending out as indicated by dotted lines. By a folding machine of any wellknown or preferred type, the sections 14' are folded in and adhesively secured along the dotted areas 15, leaving the rest of the sections 13, 14, unconnected so as to form pockets for thetongue flaps 19 hereinafter described. The production of the commercial blank in this manner is very rapid. The ends of the sections are cut away to form edges 16 which are oblique as clearly illustrated, for a purpose presently explained.

The portion 12 has end wall sections 17,

18, the latter having laterally extending tongue flaps 19 which are preferably formed with notches 20 in their inner edges." Sections 21 connect the sections '13, 17.

Blank folding lines are formed in any at 22,23, 24, 25, 26 27, 28 and 29.

' To set up the blank to form the bottom or tion- 17 is turned up as indicated in, Fig. 3,

the sections 21 doubling on line 23 and turning in on lines 24, 25. Then the section 18 suitable manner, s by creasing the blank,

is turned on line 27 and carried in to inclose the now doubled sections 21 betweenitand sections 17 this movement causing the flaps 19 to bend backwardly on lines 28 and ride down inside sections 14 to the position indicated in Fig. 4. Next, the tongue 19-, by pressure on its upper edge, is caused to bend on line 29 (see Fig. 5) until its upper edge engages the opening in the pocket formed, as hereinafter described, between sections 13,

v14, after which a slight pressure on the oblique edge 16, as will be understood by comparing Figs. 3, 4c, and 5, enables the tongue flap to be readily inserted in the pocket, and yet, the tongue, when completely in the pocket, has so much of its area therein as to render accidental removal impossible. And so slight a portion of the edge of the tongue is now accessible, that it is difficult to get it out of the pocket. And of course no part of the interengaging members is accessible or visible from the outside.

I do not limit myself to the specific details or form so far described. For instance, as shown in Fig. 2,in which reference numerals are employed the same as in Fig. 1, for similar features, but with the addition of theexponent a, the oblique edge 16 need not be straight, and the section 21*, instead of being connected to section 17, may be separated therefrom by a slit and left uncreased (no crease 23). With this form, the manipulation to" set up the box member will be substantially the same as already described, but differing in the following respects (see Figs: 7 and 8). Whensection 18 is turned in and down from the Fig. 7 position, it incloses members 21 of single. thick- 'ness, instead of doubled as in- Fig. 3,'and

I the projecting mid-length portion of the edge 16 of the pocket enables the! upper edge of tongue flap 19 to be inserted into .the pocket with such ease that no recess 20 "With the form illustratedin Figs. 9 a; 12

inclusive, in which the same reference nuv 1 'lar to .thosein Fig. 1, but with .the exponent merals are employedto designate partssimib,' a slit 16 is formed in section 14:", the

tongue flap 19 is formed tapering, and the section 2D- is cut from section -17 'at 25.

With this form, the same setting-up method is: carried out as already described, the

-tongue. l9 bein'ginserted through 'slit'16 I into- "the. pocketformed between the two- I sections-of the stood as limitations meaning that the box b side walls above the glued iline1'5.

and .end. are employed for convenience of description flonly, and are not to be under- -m ember-i's elongated. It might besquare,

or the shape .be such that thewalls which provide the pockets for the tongues might properly be termed; the end walls and the walls formed by the sections 17, 18, then gtermed'the side walls.

now described my invention, 1

. tral portion andfour walls all of which are of? doublefthickness, two fof the'walls being provided with pockets, the inner sections of the other two walls having extensions forming tongues said tongues extending into the pockets in planes at a right angle to the walls which carry said tongues,

.the inner sections of the walls which are tral portion and four'walls all of which are of double thickness, two of the walls being provided with pockets, the inner sections of the other two walls having extensions forming tongues, said tongues extending into the pockets in planes at a right angle to the walls which carry said tongues, the inner sections of the walls which are provided with pockets being permanently secured to the outer sections of said walls to prevent accidental. disengagement of the tongues from the pockets, said tongues being transversely creased to facilitate their insertion into the pockets.

3. A paper box member comprising a central portion having two side walls each of double thickness with a folded upper edge, the inner section being permanently secured along its lower portion to the outer section and said inner section having oblique end edges, and two end wallseach of double thickness with a folded upper edge, the

inner section having extensions forming tongues which enter the pockets of the side walls'behind said oblique edges in planes at Of course the. boxes may be-made in any Y size and of. any proportion. Furthermore, it is to be understood that the terms side a right angle to the said end walls, said ex tensions being transversely creased to facilifoldable sections, the outer sections having extensions formin tongues adapted to be bent at right ang es to said end sections, means being provided to enable said tongues to he slipped into the pockets formed between the sections of the side portions.

' 6. A box blank comprising a central portion, two side portions of double thickness with folded outer edges, the inner section being permanently secured to the outer portion at a point remote from said folded edge, and two end portions each comprising two foldable sections, the outer sections having extensions forming tongues adapted to be bent at right angles to said end sections, the inner sections of the side portions having oblique edges to enable the tongues to be slipped behind them.

7. Arbox blank comprising a central portion, two-side portionsjof double thickness with folded outer edges, the inner section being permanently secured to the outer portion at a point remote from said folded edge, and two end portions each comprising two foldable sections, the outer sections having extensions forming tongues adapted to be bent at right angles to'said'end sections, said tongues being transversely creased, means to sections of the side portions.

being provided to enablesaid tongues to be slipped into the pockets formed between the 8. A box blank comprising a central portion, two side portions of double thickness with folded outer edges, the inner section being permanently secured to the outer portion at a point remote from said folded edge, and two end portions each comprising two foldable sections, the outer sections having extensions forming tongues adapted to be bent at right angles to said end sections, said tongues being transversely creased and having theiredges which'fit under the folds of the side portions notched to reduce liability of tearing, means being provided to enable said tongues to he slipped into the pockets formed between the sections of the side portions. In testimony whereof l have aihxed my signature.

RoTHoHiLD F. 'rnonNnIKn 

